Palazzo Caffarelli al Campidoglio

A museum wing on the Capitoline, also called Palazzo Clementino Caffarelli or Villa Caffarelli. it.wikipedia describes it as a sixteenth-century Caffarelli residence, later the Prussian embassy, expropriated by the Italian state after the First World War, then partly demolished and rebuilt as a municipal museum linked to the Musei Capitolini; it names Gregorio Canonica as the architect.